how to replicate:
- make a vehicle with a sub grid (cut from vehicle and paste again)
- attach wheel to sub grid (in merge menu the one that is not red)
- apply steering to the wheel
how I found it:
I pasted a trailer behind a truck, this trailer has steering build in.
then I tried the other way around and then the truck didn't show the steering.
the steering still functions the wheels just don't actually turn